Abstract
Alizarin (1,2-dihydroxyanthraquinone) is a stable red photoredox sensitizer. We explored the effect of the hydroxy substituents of 9,10-anthraquinone (AQ) molecules on the photocatalytic hydrogen evolution over a dye-sensitized Pt-TiO2 system under visible-light irradiation. The 2-hydroxy group in AQ dyes was necessary to induce photocatalytic H2 evolution. By contrast, the 1-hydroxy group was the anchoring group to increase the adsorption amount of the dyes on the TiO2 surface. Using time-resolved infrared spectroscopy, we found that the 2-hydroxy group enhances the electron injection and suppresses the back electron transfer from TiO2 particles to the dye.
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This work was supported by JSPS KAKENHI [grant numbers JP23655187, JP23686114, JP20H02525, and JP20H05838].
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Investigation and visualization, Fumiaki Amano, Yasukazu Akaki, and Akira Yamakata; Writing the original draft, Fumiaki Amano. All authors have read and agreed to the published version of the manuscript.
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Below Setup for photocatalytic reaction, Photograph of dye-sensitized photocatalysts powder, Photocatalytic activity test, UV–vis spectra. Supplementary data associated with this article can be found in the online version at
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Amano, F., Akaki, Y. & Yamakata, A. Effects of Hydroxy Groups in Anthraquinone Dyes on Photocatalytic Activity of Visible-light-sensitized Pt-TiO2 for Hydrogen Evolution. Catal Surv Asia 27, 75–83 (2023). https://doi.org/10.1007/s10563-022-09370-y
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DOI: https://doi.org/10.1007/s10563-022-09370-y